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MultiModemDSVD User Guide 4 AT Commands, S-Registers, and Result Codes
41
S-Registers
Certain modem values, or parameters, are stored in memory locations called S-
registers. Use the S command to read or to alter the contents of S-registers (see
previous section).
Register Unit Range Default Description
S0 1 ring 0, 1–255 1 Sets the number of rings before the mo-
dem answers. ATS0=0 disables autoan-
swer completely.
S1 1 ring 0–255 0 Counts the rings that have occurred.
S2 decimal 0–127 43 (+) Sets ASCII code for the escape sequence
128–255 character. Values greater than 127 disable
escape.
S3 decimal 0–127 13 (^M) Sets the ASCII code for the carriage return
character.
S4 decimal 0–127 10 (^J) Sets the ASCII code for the line feed char-
acter.
S5 decimal 0–32 8 (^H) Sets the ASCII code for the backspace
33–127 character. Values greater than 32 disable
backspace.
S6 seconds 2–255 2 Sets the time the modem waits after it goes
off-hook before it begins to dial the tele-
phone number.
S7 seconds 1–255 50 Sets the time the modem waits for a carrier
signal before aborting a call. Also sets the
wait for silence time for the @ dial modifi-
er, and the time the modem waits for the
dial tone after encountering W in the dial
string.
S8 seconds 0–255 2 Sets the length of a pause caused by a
comma character in a dialing command.
S9 100 ms 1–255 6 Sets the time, in tenths of a second, that
the carrier must be present before the mo-
dem considers it valid.
S10 100 ms 1–255 14 Sets how long a carrier signal must be lost
before the modem disconnects.
S11 1 ms 50–255 95 Sets spacing and duration of dialing tones.
S12 20 ms 0–255 50 Defines the maximum period, in fiftieths
of second, allowed between receipt of the
last character of the three escape character
sequence from the computer and the send-
ing of the OK result code to the computer.
(Escape code guard time).